Refillable indicating-fuse.



G. W. FISKE.

REFILLABLE INDICATING FUSE.

APPLlCATlON FILED FEB. Z. 1915.

Patented Feb. 20, 1917.

UNITED STATES PATENT OFFICE.

GEORGE W. FISKE, OF AKRON, OHIO.

REFILLABLE INDICATING-FUSE.

Application filed February 2, 1915.

To all whom it may concern:

Be it known that I, GEORGE IV. Frsnn, a subject of the King of Sweden,residing at Akron, in the county of Summit and State of Ohio, haveinvented certain new and use ful Improvements in Refillable Indicating-Fuses, of which the following is a specification.

This invention relates to a new and useful improvement in electriccircuit fuses and proof and which at the same time serves to indicate byan external means whether the fuse Wire has been blown or melted.

A still further object of my invention is to provide a refillable fusewhich is simple in construction, durable, cheap to manufacture and onewhich is efiective in its use.

With the above and other objects in view my invention resides preferablyin the construction, combination and arrangement of parts as hereinafterset forth in the specification and illustrated in the accompanyingdrawings, in which Figure 1 is a perspective view of my improvedrefillable fuse;

Fig. 2 is a longitudinal sectional view of the same;

Fig. 3 is an enlarged detail perspective view of the fuse and the meansfor indicating the same and the circuit terminals; and

Fig. 4 is a detail perspective view of one of the circuit terminalswhich I employ in the preferred form of my'invention.

Similar reference characters indicate similar parts throughout thevarious views of the drawings.

Referring more particularly to the drawings in which the preferredembodiment of my invention is illustrated, I provide a receptacleindicated generally by the numeral 1 and having an intermediate portion2 and end portions 3 and 4. The intermediate portion 2 of the receptacle1 is preferably of an insulating fireproof material and the endSpecification of Letters Patent.

Patented Feb. 20, 1917.

Serial No. 5,730.

caps of portions 3 and 4 are preferably formed of metal such as brass,copper or the like. The intermediate portion 2 is secured to the endcaps 3 and 4 by means of rings The said intermediate portion 2 isreceived between the rings 5 and the capsll and 4, and screws 6 arepassed therethrough and are in threaded engagement with the rings 5whereby to permanently join the three sections 2, 3 and 4 of thereceptacle 1. The intermediate portion 2 of the receptacle 1 is providedsubstantially intermediate its length with an elongated opening 7 for apurpose which will be hereinafter set forth.

Mounted upon and adapted for rotation around the saidvintermediateportion 2 1. provide an outer casing 3 said outer casing 8 beingdisposed between the marginal edges 9 of the cap portions 3 and 4, saidouter casing 8 being provided withan elongated opening 10 adapted forregistration, at

times, with the opening 7 in the interme diate portion 2. in order tofacilitate access to the interior of the receptacle 1. the marginaledges 9 of the said caps 3 and 4 allowing of rotary movement of thecasing 8 relative to the portion 2 but preventing lon gitudinal movementof the said outer casing 8. The caps 3 and 4 are electrica ly connectedto the terminals of an electric circuit by means of the blades 3 and 4as is common in this type of fuse.

Circuit terminals 11 and 12 are provided in the receptacle 1, saidcircuit terminals 11 and 12 being mounted upon the caps 3 and 4 anddisposed substantially in a central longitudinal line of thereceptacle 1. One of the circuit terminals, namely 11. is preferablymounted for slidable movement relative to the receptacle 1 as indicatedto advantage in Fig. 2. A coil spring 13 is secured to the slidablymounted circuit terminal 11 for a purpose which will hereinafter becomeapparent. In order to slidably mount the circuit terminal 11. the cap 3is provided at substantially diametrically opposite points in its wallwith a pair of slots 14. The said circuit terminal 11 is preferablyT-shaped in contour as illustrated to advantage in Fig. 4. the body portion 15 thereof extending longitudinal of the receptacle 1 and havinglaterally extending portions 16 terminating in handles 17. the saidtransverse portions 16 extending through the slots 14. and are adaptedfor slidable movement therein. In order to prevent lateral movementofthe slidable circuit terminal 11, I provide a pair of lugs 18 formedupon the transverse portions 16, said lugs 18 being disposed externallyof the cap 3, one of said lugs being bent upwardly and the other of saidlugs being bent downwardly to embrace the wall of the cap 3 whereby toprevent lateral movement of the circuit terminal. The coil spring 13 hasone of its ends secured to the cap 3 at the point 19 and the other endthereof secured to the circuit terminal 11 as indicated at 20. wire 21is provided, the ends of said fuse wire being in engagement with thecircuit terminals 11 and 12 and disposedbetween the same, said fuse wirebeing of such a length as to cause the spring 13 to be distended asindicated to advantage in Fig.

2 when fastened. Any suitable means may be employed to fasten the fusewire to the circuit terminals 11 and 12, however, I have provided screwssaid screws 22 extending through the fuse wire 21 and therebysecuring'the same to the circuit terminals 12. It will thus be seen thatat all times there is a strain upon the fuse wire 21 so that when thefuse becomes melted the two sections thereof will be drawn apart. Inorder to convey the current from. the cap 3 to the circuit terminal 11 Tprovide a flexible conductor 23 having one end secured to the casing orcap 3 at the point 21 and the other end thereofin electrical connectionwith the circuit terminal 11 as indicated at 25.

From the above description taken in connection with the accompanyingdrawings it is thought that a clear and comprehensive understanding ofmy invention may be had and that its advantages will be readilyappreciated by those skilled in the art. "When the fuse becomes severedowing to the melting or blowing of the same the spring 13 will draw thecircuit terminal 11 in a direction toward the inner end of the cap 3. Itwill thus be seen that the fragments of the fuse carried by the circuitterminals 11 and 12 will be separated such a distance as to obviate anypossibility of arcing or fusing at their points. \Vhen it is desired torenew or repair the fuse the outer casing S is rotated upon the portion2 of the receptacle 1 until the opening 10 in the casing 8 registerswith the opening 7 in the portion 2. This will afford easy access to theinterior of the receptacle and the fuse may be readily renewed by thisprocess/ When the fuse is blown, the explosion of the wire invariablyresulting in such a case cannot affect combustibles surrounding thefuse. since the fuse when repaired is inclosed in a practically fireproof receptacle. The laterally extending handle portions 17 indicatewhen the fuse is blown and also serve as a means to force the circuiterminal 11 into a. position for renewing the use.

A fuse the circuit has been broken owing to the fuse blowing. Thishowever is a feature which would be determined by the manufacturer ofthe device.

While it have shown and described my in vention as possessing a peculiarform and construction it isdesired that it be understood that T may makesuch changes in the detail structure thereof, as do not depart from thespirit and scope of the invention as claimed.

Having thus described my invention, what 1 claim and desire to secure byLetters Patcut, is

1. A safety fuse, including a receptacle having an intermediate portionformed of insulating material, end portions thereon, circuit terminalswithin said receptacle, a fuse element connected with said circuitterminals, one of said terminals being mounted for sliding movement,said slidable circuit terminal having means thereon extending exteriorlyof the casing to facilitate the movement of the same and to indicatewhen the fuse is blown, an opening arranged in said intermediateportion, and a rotatable casing member arranged about said intermediateportion having an opening arranged in one side thereof adapted to bemoved into register with the opening in the intermediate portion, forthe purpose as set forth.

2. A. safety fuse, including a receptacle, end portionsin communicationwith the adjacent terminals of an electrical circuit, a fuse within saidreceptacle and connected with said circuit terminals, means for drawingthe ends of said fuse apart when the same has been blown, and an elementfor connecting one end of said fuse to said means. said elementcomprising a substantially T-shaped link having the lateral extremitiesthereof supported within slots arranged in said receptacle.

8. A safety fuse, including a receptacle having an intermediate portionformed of insulating material, end portions in communication with theadjacent terminalsof an electrical circuit, a fuse within saidreceptacle and connected with said circuit terminals, means for drawingthe ends of said fuse apart when the same has been blown, an element forconnecting one end of said fuse to said means. said element comprising asubstantially T-shaped link having the lateral extremities thereofsupported within slots arranged in said receptacle, an opening arrangedin one side of said receptacle, and a rotary casing member associatedwith said upon said slidable circuit terminal extending receptaclehaving an opening arranged in exteriorly of the receptacle to facilitateone side thereof, adapted to register with the movement of the same andto indicate when opening in said receptacle for the purpose as the fuseis blown. 1 15 5 set forth. In testimony whereof I afiix my signature 4.A safety fuse, including a receptacle, in presence of two witnesses.circuit terminals within said receptacle, a

fuse within the receptacle and connected S with said circuit terminals,one of the termi- Witnesses: v 10 nals being mounted for slidingmovement in CHAS. T. VmsING,

slots arranged in said receptacle, and means SOPHA J. BECKER.

